Portable pulley-block crane.



E. CAMERON. PORTABLE PULLEY BLOCK CRANE.

APPLICATION FILED DEG. 6, 1912.

Patented June 9, 1914,

A florneys.

COLUMBIA PLANOOILAPH CO-.WA5MINO10N. D- C- curved to the shape shown in EWAN CAMERON,

or WASHINGTON, NEW

JERSEY, ASSIGNOR T0 JOHN ROBERT TAYLOR, OF BROOKLYN, NEW YORK.

PORTABLE PULLEY-BLOCK CRANE.

Specification of Letters Patent.

Patented June 9, 1914.

Application filed December 5, 1912. Serial No. 735,031.

To all whom it may concern Be it known that I, Ewan OAMnnoN,a citizen of the United States, and a resident of \Vashington, county of Warren, and State of New Jersey, have invented a certain new and useful Portable Pulley-Block Crane, of which the following is a specification, reference being had to the accompanying drawings.

The object I have in view is the produc tion of a portable pulley block crane, which will be cheaper, lighter and more durable than those heretofore suggested, and which will have increased stability.

A further object is to render the crane more portable than heretofore.

These and further objects will appear from the following specification and the accompanying drawings, considered together or separately.

In the drawings, Figure 1 is a plan view of a device embodying my invention; Fig. 2 is a side view of the same; Fig. 3 is an end view; Fig. 4 is a sectional view, taken on the line 4-4 of Fig. 1; and Fig. 5 is a plan view of the steering device, in one Position.

In all of the views like parts are designated by the same reference characters.

In carrying out my invention, I provide a U-shaped base 1, best made of channel iron. Connecting the arms of the base is a cross member 2, such cross member being shown in Fig. 1 as connecting the arms about their mid-length. The vertical member 3 of the crane is made of I-beam iron, is Fig. 2 and is secured at its lower extremity to the center of the cross member 2. The upper eXtremity of the vertical member is curved to approximately horizontal shape and is pro vided with an eye 1 to which the tackle is secured. The location of this eye 4 is on a vertical plane beyond or behind the cross member 9.-the free ends of the base for the purpose of this description being considered the rear of the structure. The vertical member is additionally secured in position by means of braces 5 which are attached to the said member at about its center, and are connected to the curved portion of the base. The structure thus described is light, cheap and efficient.

The base 1 is supported upon wheels, by means of which it may be moved about. These wheels, as shown, are four in number.

The two back wheels 6, 6 are carried by axles 9, 9, which are secured to the free ends of the base 1, and also upon the U-shaped frame 7. This latter frame is secured to the base 1 by top and bottom plates 8, 8. Suitable spacing members are inserted between these plates. Thcse plates 8, 8, together with the base portion of the U-shaped frame 7 constitute the cross member 2. The axles 9, 9 tie the free ends of the U frame 7 to the free ends of the base 1, and produce a very light, cheap and strong structure.

The front wheels 10, 10 are secured in frames 11, which are connected to the base 1 toturn on Vertical pivots 12, such pivots being located at the curved portion of the base. As shown in Fig. 1, these pivots pass through cars 18 secured to the inner side of the curved portion of the base. The two front wheels 10, 10 are separated a sufficient distance to increase the stability of the structure, and thus give it a veritable fourpoint support, which would not be the case if they were brought very close together.

For the purpose of moving the structure about, I connect each of the front wheels with a hand rod or shaft 14, which is connected to the axle of the front wheel and to the frame 11 by a frame 15. The free ends of the two hand rods 14; are connected together by a link 16. By means of this link both handv rods 14twill turn together, and the crane may be pulled or pushed by them as desired. When the device is at rest, the rods are raised and rest upon the curved part of the base 1. The weight of the link will keep it seated against the base 1.

Each of the frames 15 is rigidly connected to the frame 11, and, always remains in the horizontal position shown. The hand rod is connected to the frame 15 by means of a pivot 17, so that it can be raised. The attachment of the hand rod to the wheel, through the agency of the frame 15, and pivot 17, at a point in advance of the pivot 12, is a great advantage over a construction whereby the rod is connected to the wheel through the agency of a pivot in line with the axle of the wheel, and immediately below the pivot 12.

Fig. 5 shows being turned. stresses at the pivots 15 on the pivots 12. of the hand rod were in my improved structure when The two hand rods, exerting 17 will turn the frames If the horizontal pivot line with the axle l of the wheel, as in other structures which I ratus which I now link 16 twisted. This 7 is merely illustrative and that the invention may be carried out in other ways.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

A crane having in combination, a base, formed of two members, the outside member being u-shaped with a curved central part,

Copies of. this patent may be obtained the apparatus, and

the inside member being U-shaped with a substantially straight central part, both members having end parts,.which are substantially straight and parallel with a separating interval between them,- connecting means between such members adjacent to the straight central part of the inside member, a supporting wheel located between the ends of each member on each side, a vertical load supporting arm curved at the top to overhang the space inclosed by the legs of the base and connected to the central part of the second member, intermediate its ends with the curved part of the first member, and asupporting wheel carried by said central part of the outside member. 7 V

This specification signed and witnessed this 4th day of December, 1912.

EWAN CAMERON.

Witnesses:

JOHN L. Lo'rson, GEO. J. HANSON.

for five cents each, by addressing the Commissioner of Patents. Washington, D. 0." V

braces connecting such arm 

